chapter 3 Flashcards
on and off push button
line switch; inside room
measures the amount of current passing through the wires of the circuit
milliampere
voltmeter measures the difference in current potential or voltage across an xray
kilovolt peak
activates the xray production process
exposure button; outside room on panel
flows continuously in one direction
direct current
changes its direction of flow 60 times per second; series of impulses rather than in a continuous flow
alternating current (AC)
the path that electricity flows
electrical circuit
electromagnetic device for changing the current coming into the dental xray machine(step up and step down)
transformer
a voltage compensator that corrects minor fluctuations in current flowing through the wires
autotransformer
measures number of electrons that move through conductor; measures the quantity of electrons
amperage
electrical pressure between two electrical charges(speed of electrons)
voltage or volt
highest voltage to which the current in the tube rises during an exposure
kilovolt peak
produces xrays when a stream of high speed electrons are stopped or slowed down
xray tube
negative electrode; tungsten wire/filament; focusing cup
cathode
positive electrode; target; copper stem/radiator
anode
smallest on anode; smaller, sharper the image; small rectangular area on target of anode to which the focusing cup directs the electron beam
focal spot
directs the electrons toward the target on the anode
focusing cup
the filament wire on cathode, when heated to incandescence red hot and glowing, produces electrons
cathode; thermionic emission
to provide a target to stop or significantly slow the high velocity electrons, converting their kinetic energy into xrays
anode
release of electrons from hot filament when current flows after depressing exposure switch; the hotter the filament gets, the greater the number of electrons that are released
thermionic emission
what is the focusing cup made of
molybdenum
provides low voltage(3-8 V) to the filament of the xray tube to provide the source of electrons needed for the production of xrays
filament circuit
provides the high voltaage (65-100 kV) necessary to accelerate the electrons from the cathode filament to the anode target
high voltage circuit
step down volts
3-8
step up volts
60-100kV
xray in the center of the primary beam
central ray
what is removed by an aluminum filter
long wavelength and low penetrating xrays
number of xrays
quantity
penetrating ability of beam
quality
